staging: wilc1000: linux_mon: remove debug message of kmalloc failure

There is no need to print debug message when kmalloc is failed.
This message is redundant. The code already show us that kmalloc is
failed. The braces of first if statement is remove as well because if
statement has a single statement.
Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/linux_mon.c

@@ -164,14 +164,11 @@ static int mon_mgmt_tx(struct net_device *dev, const u8 *buf, size_t len)
 
 	netif_stop_queue(dev);
 	mgmt_tx = kmalloc(sizeof(*mgmt_tx), GFP_ATOMIC);
-	if (!mgmt_tx) {
-		PRINT_ER("Failed to allocate memory for mgmt_tx structure\n");
+	if (!mgmt_tx)
 		return -ENOMEM;
-	}
 
 	mgmt_tx->buff = kmalloc(len, GFP_ATOMIC);
 	if (!mgmt_tx->buff) {
-		PRINT_ER("Failed to allocate memory for mgmt_tx buff\n");
 		kfree(mgmt_tx);
 		return -ENOMEM;
 	}